Ink jet recording sheet
AssigneeOji Paper Co., Ltd.
InventorsHiroyuki Nemoto, Koichi Yasui, Shunichiro Mukoyoshi
Life of this patent
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Abstract
In an ink jet recording sheet including a substrate sheet having a base paper sheet and at least a front polyolefin laminate layer formed on at least a front surface of the base paper sheet, and an ink receiving layer formed on the front polyolefin laminate layer, the surface of the front polyolefin laminate layer has a center-line mean roughness (Ra) of 0.1 to 10 μm, determined in accordance with JIS B 0601-1982, the ink receiving layer contains a mixture of hydroxypropylmethyl cellulose with polyvinyl pyrrolidone in a mixing weight ratio of 100:10 to 100:150 and has a 75° specular gloss of 30% or more determined in accordance with JIS P 8142-1993.
Claims15
An ink jet recording sheet, comprising a substrate comprising a base paper sheet and at least a front polyolefin laminate layer formed by extrusion-laminating a polyolefin resin composition on at least a front surface of the base paper sheet, the surface of the front polyolefin laminate layer being finely roughened and exhibiting a center-line mean roughness (Ra) or 0.1 to 10 μm, determined in accordance with Japanese Industrial Standard B0601-1982;
- and an ink receiving layer formed on a surface of the polyolefin laminate layer of the substrate, and comprising a mixture of hydroxypropylmethyl cellulose with polyvinyl pyrrolidone in a mixing weight ratio of 100:10 to 100:150, the surface of the ink receiving layer exhibiting a 75° specular glossiness of 30% or more, determined in accordance with Japanese Industrial Standard P8142-1993,
- (1) wherein a front-side intermediate layer comprising at least one polymeric material selected from the group consisting of gelatin, polyvinyl alcohol and cation-modified polyvinyl alcohols, is formed between the polyolefin laminate layer of the substrate and the ink receiving layer, and
- (2) the ink receiving layer formed on the front-side intermediate layer exhibits an ink absorption capacity of 1.5 ml/g or more, but less than 10 ml/g, and the front-side intermediate layer exhibits an ink absorption capacity of 0.1 ml/g or more but less than 1.5 ml/g.
Dependencies are inferred from the claim text.